About the article

Running text display

controlled by a COP-8 microcontroller

Running text display
It’s hard to keep track of how many running text displays you run across nowadays. You can find them used as decorations in shop windows, as programmable signboards and as simple eye-catchers. If you buy one ready-made, however, it’s fairly expensive, and they are usually too complex for DIY construction. The running text display project in this article combines a simple and inexpensive design with repeatable construction and ease of use.The objective of the running text display project was to develop a simple, inexpensive design that would not be too difficult to build and would be easy to use. We intentionally decided not to make the display as large as possible or to implement a lot of different display modes, since these would require a powerful microcontroller or a singleboard computer. The result is a circuit that is controlled by an inexpensive National Semiconductor microcontroller with 4 kB of ROM, and which can be built using readily obtainable components.
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Component list
R1 = 10?
R2 = 100k?
R3 = 470?
R4 = 1M?
C1,C2 = 33pF
C3 = 100nF
C4 = 220µF 16V
D1 = TSUB8201
T1 = ZTX603
IC1 = COP8782 (order code 996527-1)
IC2 = 7805
IC3 = ZSM560
K1 = 5-way DIN socket 180° or PS2-socket
X1 = 10MHz quartz crystal
R1-R7 = 47?
R8 = 1M?
R9 = 100k?
R10-R16 = 750?
R17 = 100?
C1,C2 = 33pF
C4 = 100nF
C5 = 10µF 16V
C6 = 2000µF 25V (or 2200µF 25V)
C7 = 2000µF 16 V (or 2200µF 16V)
B1 = bridge rectifier B80C1000 (80V piv, 1A)
T1-T7 = BC557
IC14-IC20 = see text
IC21-IC25 = 74164
IC26 = COP8782C (order code 996527-2)
IC27 = ZSM560
IC28-IC32 = ULN2803 (Sprague)
IC33 = 93C66CB1 (ST-Microelectronics)
IC34 = TFMS5360
IC35 = 7805
Mains adaptor socket
Small heatsink for IC35
X1 = 10MHz quartz crystal
Disk. source code file, order code 996032-1
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